Last of wine provided by vineyard has dull colour (4)
I believe the answer is:
ecru
'dull colour' is the definition.
'ecru' can be an answer for 'colour' (ecru is a kind of colour). I am not certain of the 'dull' bit.
'last of wine provided by vineyard' is the wordplay.
'last of' indicates one should take the final letters.
'provided by' is a charade indicator (letters next to each other).
'vineyard' becomes 'cru' (I've seen this in another clue).
The last letter of 'wine' is 'e'.
'e'+'cru'='ECRU'
'has' is the link.
Can you help me to learn more?
(Other definitions for ecru that I've seen before include "Raw linen colour" , "Strange cure for a colour" , "Neutral colour" , "Buff colour" , "Cure (anag) - unbleached linen" .)